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Geochemistry International

, Volume 56, Issue 7, pp 628–650 | Cite as

Age and Geochemistry of the Cape Burks Gabbroids (Russkaya Station Area, West Antarctica)

  • D. A. Tkacheva
  • E. V. Mikhalsky
  • N. M. Sushchevskaya
  • E. L. Kunakkuzin
  • S. G. Skublov
  • S. A. Sergeev
Article
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Abstract

The paper reports first geological, chemical, mineralogical, Sr–Nd chemical–isotope, and geochronological data on the gabbroid massif discovered on the Hobbs coast in the Cape Burks area, West Antarctica. The area is made up of compositionally diverse gabbroids that are intersected by thin vein and dike bodies of mafic, intermediate, and fesic composition. The gabbroids are represented by olivine and olivinefree gabbros and gabbronorites, with sharply subordinate troctolites, gabbro–anorthosites, and anorthosites. The U–Pb SHRIMP–II zircon age of the gabbroids and vein rocks was estimated at 100 ± 1 Ma. The gabbroids were supposedly emplaced in the upper crust in tectonically active conditions. The thickness of the pluton is no less than 2.5–3 km. The rocks were crystallized from a highly fractionated melt. Their composition was mainly determined by accumulation and fractional crystallization. The origin of vein felsic rocks was likely related to an evolved residual liquid. The igneous complex was formed in a within–plate geodynamic setting, and its primary melts were derived from a weakly LILE enriched lithospheric mantle.

Keywords

West Antarctica Marie Byrd Land gabbroids U–Pb age geodynamics 
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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • D. A. Tkacheva
    • 1
  • E. V. Mikhalsky
    • 1
  • N. M. Sushchevskaya
    • 2
  • E. L. Kunakkuzin
    • 3
  • S. G. Skublov
    • 4
    • 5
  • S. A. Sergeev
    • 6
    • 7
  1. 1.Gramberg All-Russia Research Institute of Geology and Mineral Resources of the World OceanSt. PetersburgRussia
  2. 2.Vernadsky Institute of Geochemistry and Analytical ChemistryRussian Academy of SciencesMoscowRussia
  3. 3.Geological Institute, Kola Science CentreRussian Academy of ScienceApatity, Murmansk. obl.Russia
  4. 4.Institute of Precambrian Geology and GeochronologyRussian Academy of SciencesSt. PetersburgRussia
  5. 5.St. Petersburg Mining UniversitySt. PetersburgRussia
  6. 6.Earth’s Science InstituteSt. Petersburg State UniversitySt. PetersburgRussia
  7. 7.Karpinskii All-Russia Research Institute of GeologySt. PetersburgRussia

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